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🌳 Challenge III: Interact With A Deployed Contract On zkEVM Testnet

Description

Interact with an existing contract deployed to zkEVM Testnet. This challenge had intermediate difficulty and may take a bit to complete.

Rewards

Claim a Cool zkThon T-shirt. [Sharing the design with you all soon!]

Get Started 🏃🏻‍♂️

  • Configure your wallet for the zkEVM Testnet for development here.

  • Checkout this video by Steph Orpilla, Devrel Engineer - Polygon Labs to help you with setting up the local development and building a fullstack dApp with Polygon zkEVM, link to the repo here for reference.

  • Claim some tokens required to work with Polygon zkEVM testnet here

  • Take a look at the following solidity contract for reference, which has been deployed to this contract address on zkEVM Testnet.

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

contract ZkThon {
    // Events that allows for emitting a message
    event NewSubmission(address sender, string message);

    // Variables
    string username;

    // Main constructor run at deployment
    constructor(string memory _username) {
        username = _username;
        emit NewSubmission(msg.sender, _username);
    }

    // Get function
    function getCurrentSubmission() public view returns (string memory) {
        return username;
    }

    // Set function
    function submitUsername(string memory _username) public {
        username = _username;
        emit NewSubmission(msg.sender, _username);
    }
}

  • Look over this solidity code to understand its functions and inputs to better understand the contract functionality.

  • After understanding the contract functionality, create a simple script to interact with the contract in a programming language of your choosing by updating the username with your github username. To interact with the contract more easily, you could use a library like ethers, viem, or Web3.js, to name a few options.

  • Use your script to call the submitUsername function on the contract while supplying your github username (without the @). For a reference example on how this may be done, you could utilise Steph's video. If you get stuck, you could always ask us questions in this Telegram group, and we'll attempt to assist you.

OR

  • Use the deployed contract from challenge-2 to interact with. You can use any method call and get the txn hash of it.

  • Retrieve the transaction URL that was completed onchain and paste it into your new file for solution-3.md

Example:

https://explorer.public.zkevm-test.net/tx/0xc62996c8599534f93a404a5b9614357aa36c4166f5230d80bcecf4af995aded8

Challenge Submission and guidelines

  • Fork the repository [we hope you did that already 💫]

  • Create a new branch (if not already created) username_zkthon, e.g. PriyathamVarma_zkThon [we hope you already did this too💫]

  • Now let's create a file named as solution-3.md.

  • Paste the code used in your preferred language that is used to interact with the smart contract.

  • Now also paste the URL transaction into solutions-3.md

  • [VERY IMPORTANT STEP] Take the Transaction Hash and Contract Address and put it the Airtable form below with rest of the details.

Submission Challenge III form

This is an Important step please don't skip.